Malicious PDF — malware analysis report

Static analysis result for SHA-256 9209d4ea64807d6e…

MALICIOUS

PDF

71.6 KB Created: 2021-02-24 21:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b40f2359a219647a6528395f94d2ec9e SHA-1: 7587228b10195e190ef31a1acd796e134848d1be SHA-256: 9209d4ea64807d6e136cd59c218bc7e8786521c88f3a0b11cc2bce7c773f19b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/123?utm_term=what+is+weary+blues+about'. This indicates the document's primary purpose is to redirect the user to a potentially malicious website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=what+is+weary+blues+about In PDF document text
    • http://helpcreditscore.info/bersa_thunder_380_plus_kydex_holsterjslsv.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/public_speaking_tips_for_students.pdfIn PDF document text
    • https://lufeziwupidel.weebly.com/uploads/1/3/5/3/135345985/fububobumobibum.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/kaner.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/nadodolexuriwib.pdfIn PDF document text
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/gawekimanuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_6014fb48ef633.pdfIn PDF document text
    • http://sweetygirl.club/43838162778vrjsu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_5fe0fd77e1b9c.pdfIn PDF document text
    • http://mjawebdesign.net/vutatinojofemiregixixobizou9os.pdfIn PDF document text
    • http://akfb.online/dupakaludesekukinuxinc6msk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeroguru/amway_diamond_celebration_music.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/vezaxidazana.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/what_is_the_most_used_drug_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/jekegi.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/zudulipizazipevawapoput.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/bikituk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 5120 bytes
SHA-256: f8bda2afbf59ee82bd5c5410ee3efa05b1f80678886ca5942b3acba17d9e2c33
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 11168 bytes
SHA-256: d54b70937625fad26f347025b91ee13a99afa28e38ffe09b8bb75890d4ae14f6

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